Have you ever been to Computer Village in Ikeja to purchase a phone? Usually, there are some guys hanging around asking you to install antivirus on your phone. As far as I can tell, you do not need an anti-virus app on your phone.
I have owned and used over 100 mobiles, and not one of them ever got infected with a virus or malware. Of the phones I have owned, 90 of them were smartphones – Symbian (18 devices), Android (20 devices), Windows Mobile (9 devices), Palm (1 device), WebOS (2 devices), iOS (3 devices), Windows Phone (5 devices), Maemo/MeeGo (2 devices) and BlackBerry (9 devices). Not once has any of my devices been infected with a virus or malware.
It is not that mobile viruses do not exist. It is that for the most part, they are unable to infect your device without your consent. If someone copies a virus to your phone, it is harmless and cannot run without you authorising it to. When it comes to malware, stick to official sources for your apps, and you are good. If you go installing apps from unknown sources (including rooting and jailbreaking), well, you might get stung by malware. But that is your doing. The average mobile user has nothing to fear from viruses and malware. At least for now.
Till further notice, mobile virus is a big hype. Don’t believe the hype.